Information Technology Reference
In-Depth Information
Define the following key terms from this chapter, and check your answers in the glossary:
ACD, BHT, CAC, CC S, CDR, CO, Centrex, codec, companding, cRTP, CUCM, Er-
lang, E&M, FXS, FXO, gatekeeper, gateway, GoS, H.323, LLQ, MGCP, MOS, OAM,
PSTN, PBX, RSVP, RTP, RTCP, SCCP, SIP, SS7, VAD
The answers to these questions appear in Appendix A. For more practice with exam for-
mat questions, use the exam engine on the CD-ROM.
1.
Tr ue or fals e: LLQ is recommended for VoIP net work s.
2.
Tr ue or fals e: H.323 is an IETF standard, and SIP is an ITU standard for mult imedia
protocols.
3.
Tr ue or fals e: A n Erlang is a unit that de s c r ibe s the number of c alls in an hour.
4.
What do you implement to stop packets from being transmitted when there is silence
in a voice conversation?
5.
The variable delay of received VoIP packets is corrected with what kind of buffers?
6.
Tr ue or fals e: Common Channel S ig naling u s e s a s eparate channel for s ig naling.
7.
Tr ue or fals e: FXO por ts are u s ed for phone s, and FXS por ts connec t to the P STN.
8.
Tr ue or fals e: S S7 prov ide s mechanis m s for exchang ing cont rol and rout ing me s s age s
in the PSTN.
9.
An organization uses what kind of system to gather and provide information for the
customer before transferring her to an agent?
10.
An organization uses what kind of system to route calls to agents based on the agent
skill group or call statistics?
11.
In addition to codec selection, both _______ and _______ can be used to reduce the
bandwidth of VoIP calls.
12.
Label each of the following delays as fixed or variable:
a.
Processing
b.
Dejitter buffer
c.
Serialization
d.
Queuing
e.
Propagation
13.
How can you reduce serialization delay?
14.
